.TH std::flat_set::extract 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::flat_set::extract \- std::flat_set::extract

.SH Synopsis
   container_type extract() &&;  (since C++23)

   Extracts adapted container c. Equivalent to return std::move(c);.

   After this operation *this is empty, even if an exception is thrown.

.SH Parameters

   \fI(none)\fP

.SH Return value

   std::move(c).

.SH Complexity

   Constant.

.SH Example


// Run this code

 #include <cassert>
 #include <flat_set>
 #include <print>
 #include <type_traits>
 #include <vector>

 int main()
 {
     std::flat_set<int> set{1, 2, 3};
     const auto size = set.size();

     auto c = set.extract();
     assert(c.size() == size);
     assert(set.empty());
     assert(set.keys().empty());
     assert(set.values().empty());

     // The default keys container is std::vector:
     static_assert(std::is_same_v<decltype(c), std::vector<int>>);

     std::println("{}", c);
 }

.SH Output:

 [1, 2, 3]

.SH See also

   replace replaces the underlying container
           \fI(public member function)\fP
